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If you charge an isolated metal sphere by putting it in contact with an identical uncharged sphere, the charge on each sphere after contact is
AZero on both
BThe same as before contact
CTwice the original charge
DHalf the original charge by symmetry
Answer & Solution
Correct answer: D. Half the original charge by symmetry
By symmetry, identical conducting spheres in contact share charge equally. This was Coulomb's method for halving charges (q → q/2 → q/4 …) without measuring the absolute value of charge.
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